Parameters:
(1) measured QT interval in milliseconds
(2) RR interval in seconds
corrected QT in milliseconds =
= (measured QT) / (RR^0.333)
Performance:
• The equation works better at lower heart rates (Karjalainen).
• It underestimates the QT interval when the heart rate is less than 60 beats per minute.
Moss reports an equation from Fridericia's paper:
predicted QT interval in 100th of a second =
= 8.22 * ((RR interval in 100th of a second) ^ 0.333)
predicted QT interval in milliseconds =
= (QT interval in 100th of a second) * 10
